Remove unreachable Html::rawElement( 'br' )

Change-Id: Ie2ddab58ee3ec19a714ce1573d7f59ac658bb87f
Swap deprecated key_exists() for array_key_exists()

key_exists was deprecated in PHP 4.0.6

Change-Id: I041a3efef6ae61c4032497646ebe2105546cb43e
Merge "Swap deprecated key_exists() for array_key_exists()"